PRC as a amplifier in GPS question.

[valiumboy]

From: "Ayn Marx" <mdhjwh@iprimus.com.au>
Subject: Re: WANTED: Sales staff for AV store
Date: Sunday, April 03, 2005 12:18 PM


Phil's Mum wrote:

< .............. Large Snip from a gorgious fairy tale.

Now I know my Philip is devoted to his work. He's never been married
and
doesn't have a girlfriend, although I'm not completely sure of that,
as
there was a pink tutu hanging in his wardrobe along with some red
glitter
stiletto shoes. Anyhow Philip has never mentioned her and I surely
have not
been introduced.

Stop it! Now I'm going to have nightmares about PA in a pink tutu with
red glitter stillettos.

Oh, & Mrs A, you forgot to mention Phil's expert facility with Harmon
Kardon 'Soundsticks'

 

[Richard]

Mainlander wrote:

Cheap inverters put out square wave voltage/current. As there is a
significant DC component in the waveform, gear that expects a varying
voltage will not work so well with it. Thus you may not be able to draw
the full rated load if your equipment contains, say, a simple power
supply with a 50 Hz mains transformer, since the DC will not pass through
the transformer, only the very small part of the waveform where it goes
instantaneously from +230 to 0 (or is that +115 to -115) will be passed.
Thus the power that can be drawn off will be less than the usual
V*I*power factor bit that would be expected.

I havent seen a pure squarewave inverter ever. The cheap ones I have seen are
all modified sinewave double conversion.

They have a 12v to + and - 320V DC step up, which is filtered and then a second
conversion that takes the 320vDC rails and makes a squarewave with off time to
make the RMS of it 230ish volts.

Can't remember what the other limitation of a square wave output are - I
think it has something to do with the peak being at 230 V instead of 325V
as is the case with a sine wave - or the RMS voltage or something.

As above, not an issue on current cheapies

I was at a place where a guy ran an audio amplifier off an inverter, the
amp would have had an ordinary 230V 50Hz mains transformer, rectifier and
caps in the power supply. The thing actually hummed quite a lot - only to
be expected as the power supply caps would have insufficient capacity to
smooth out a much rougher DC waveform that the transformer would supply.

My stereo amp doesnt output any buzz on the inverter, but the amp itself buzzez
from the big torroid like anything.

 

[Richard]

Richard wrote:

Mainlander wrote:

DAMN - orcons new news server is bring back posts from the past and putting them
at the bottom of the list. Grrr.. Bad Orcon

 

[Phil Allison]

"Richard" <rich@ihug.co.nz>

Mainlander wrote:

Cheap inverters put out square wave voltage/current. As there is a
significant DC component in the waveform, gear that expects a varying
voltage will not work so well with it.

** Oh noooo !

Not this sheep shagger imbecile with his demented, C grade, horror movie
type ***garbology** AGAIN !!!





........... Phil

 

[Richard]

Phil Allison wrote:

Not this sheep shagger imbecile with his demented, C grade, horror movie
type ***garbology** AGAIN !!!

My mistake for assuming that the thread at the bottom of the list sorted by date
would have being new.... Stupid orcon server change...

 

[Phil Allison]

"Richard"

Phil Allison wrote:

Not this sheep shagger imbecile with his demented, C grade, horror movie
type ***garbology** AGAIN !!!

My mistake for assuming that the thread at the bottom of the list sorted
by date would have being new.... Stupid orcon server change...

** Google reveals the original "Mainlander" post as being :

Date: 2003-11-16 00:37:41 PST





............ Phil

 

[FreedomChooser]

On Thu, 14 Apr 2005 23:41:42 +1200, Richard <rich@ihug.co.nz> wrote:

Phil Allison wrote:

Not this sheep shagger imbecile with his demented, C grade, horror movie
type ***garbology** AGAIN !!!

My mistake for assuming that the thread at the bottom of the list sorted by date
would have being new.... Stupid orcon server change...

No apology is necessary to that Australian sand eater

 

[Richard]

Phil Allison wrote:

** Google reveals the original "Mainlander" post as being :

Date: 2003-11-16 00:37:41 PST

So does both mozilla and outlook express, but they both put it at the bottom of
the list for some reason, so I assumed they were new.

 

[Tom]

Giatto Cardiacci wrote:

Do you know any long range wireless communication gadget (radio modem etc.)
that can be used for 115200 bits/sec continuous data transfer over 100 km ?

(Imagine you are on a boat/ship and you have a UAV. You want to fly your
UAV to 100km away and you want continuous comm with the UAV. Because one end
of the communication is an small airplane the smaller size and lighter
weight for the gadget are peferred.)

Have a look at http://www.elprotech.com but the range is 20-30 km under
good conditions

 

[Martin X. Moleski, SJ]

On Fri, 15 Apr 2005 08:57:30 -0400, mlw <mlw@nospam.no> wrote:

... a remote control plane with a 62
mile range could be a poor man's cruise missile.

Life is like that.

Legitimate hobby and commercial technology can be turned
into weaponry (think fertilizer being turned into a bomb
in Oklahoma).

I hope the guy is legit, and, if he is, that he finds the
answer to his questions.

If not, I hope the good guys find him before he launches
his RPV. )

Japanese companies developed an RC helicopter for
spraying under GPS guidance years ago. Aersonde
has shown how to fly an RPV across the oceans at
a relatively low cost ($25,000 per vehicle a few years
back). Maynard Hill figured out how to do the same with
an 11-pound model (wet!).

r.m.rc.air isn't going to stem the tide of technological
development of RC equipment, for good or for ill.
We don't have a monopoly on the information that
makes these systems tick.

Marty

 

Giatto Cardiacci> wrote:

Do you know any long range wireless communication gadget (radio modem
etc.)
that can be used for 115200 bits/sec continuous data transfer over 100 km
?

(Imagine you are on a boat/ship and you have a UAV. You want to fly your
UAV to 100km away and you want continuous comm with the UAV. Because one
end of the communication is an small airplane the smaller size and
lighter
weight for the gadget are peferred.)

62 mile radius? Over 12 thousand square mile area? That's tricky, very
tricky, 115kbs sort of fast, but maybe not unmanagably fast.
What are weight requirements?
What are budget constraints?
Can you maintain "line of sight?"
Can you prepare the site, i.e. lay down repeaters?
Will you be near cellphone towers?
What about satalite internet?

If you don't mind me asking, what for? It sounds like you have a very
specific application in mind, and to be honest, I can't think of any
really
legitimate use. Sure, you may be able to do it, but I can't see any hobby
use, and if it were a corporate or military project you wouldn't be asking
so publically. Maybe I'm paranoid, but a remote control plane with a 62
mile range could be a poor man's cruise missile.

Unfortunatelly most of us are programmed by the mass media to think
pesimisticly.
Yes you may be right that a UAV with 100km range would be dangerous on
wrong hands.
But was thinking differently.
Application I had in mind was monitoring the very large disaster areas.
As we all learned that, unfortunate tsunami and recent earthquake can and
did change the region's maps.
Boats ships could not use their pre-disaster maine maps to navigate around
islands.
Human operated helicopters and airplanes are used for both for monitoring
and for aid delivery.
I think it may be possible to use long range UAVs in such humanitarian
applications.

 

Do you know any long range wireless communication gadget (radio modem
etc.)
that can be used for 115200 bits/sec continuous data transfer over 100 km
?

(Imagine you are on a boat/ship and you have a UAV. You want to fly your
UAV to 100km away and you want continuous comm with the UAV. Because one
end of the communication is an small airplane the smaller size and
lighter
weight for the gadget are peferred.)

62 mile radius? Over 12 thousand square mile area? That's tricky, very
tricky, 115kbs sort of fast, but maybe not unmanagably fast.
What are weight requirements?
What are budget constraints?
Can you maintain "line of sight?"
Can you prepare the site, i.e. lay down repeaters?
Will you be near cellphone towers?
What about satalite internet?

If you don't mind me asking, what for? It sounds like you have a very
specific application in mind, and to be honest, I can't think of any
really
legitimate use. Sure, you may be able to do it, but I can't see any hobby
use, and if it were a corporate or military project you wouldn't be asking
so publically. Maybe I'm paranoid, but a remote control plane with a 62
mile range could be a poor man's cruise missile.

Unfortunatelly most of us are programmed by the mass media to think
pesimisticly.
Yes you may be right that a UAV with 100km range would be dangerous on
wrong hands.
But was thinking differently.
Application I had in mind was monitoring the very large disaster areas.
As we all learned that, unfortunate tsunami and recent earthquake can and
did change the region's maps.
Boats ships could not use their pre-disaster maine maps to navigate around
islands.
Human operated helicopters and airplanes are used for both for monitoring
and for aid delivery.
I think it may be possible to use long range UAVs in such humanitarian
applications.

 

Do you know any long range wireless communication gadget (radio modem
etc.)
that can be used for 115200 bits/sec continuous data transfer over 100 km
?

(Imagine you are on a boat/ship and you have a UAV. You want to fly your
UAV to 100km away and you want continuous comm with the UAV. Because one
end of the communication is an small airplane the smaller size and
lighter
weight for the gadget are peferred.)

62 mile radius? Over 12 thousand square mile area? That's tricky, very
tricky, 115kbs sort of fast, but maybe not unmanagably fast.
What are weight requirements?
What are budget constraints?
Can you maintain "line of sight?"
Can you prepare the site, i.e. lay down repeaters?
Will you be near cellphone towers?
What about satalite internet?

If you don't mind me asking, what for? It sounds like you have a very
specific application in mind, and to be honest, I can't think of any
really
legitimate use. Sure, you may be able to do it, but I can't see any hobby
use, and if it were a corporate or military project you wouldn't be asking
so publically. Maybe I'm paranoid, but a remote control plane with a 62
mile range could be a poor man's cruise missile.

Unfortunatelly most of us are programmed by the mass media to think
pesimisticly.
Yes you may be right that a UAV with 100km range would be dangerous on
wrong hands.
But was thinking differently.
Application I had in mind was monitoring the very large disaster areas.
As we all learned that, unfortunate tsunami and recent earthquake can and
did change the region's maps.
Boats ships could not use their pre-disaster maine maps to navigate around
islands.
Human operated helicopters and airplanes are used for both for monitoring
and for aid delivery.
I think it may be possible to use long range UAVs in such humanitarian
applications.

 

[Jerry G.]

They do not give any service support for spare parts, or service
information. You must send the monitor back to them for service, if you
feel that it is worth to repair.

If the monitor is out of warranty, you may be best off to get a new
one, after considering the cost of the service, and the shipping.

If you are familiar with LCD monitor servicing, the only thing you can
do on your own, is to open the monitor, and see if there is something
obvious that you can service yourself.

Generic type parts, such as common semiconductors, resistors, and
capictors can be bought from most electronic suppliers. For some of
these monitors, there are generic type backplane lamps, and ballast
transformers.

Where you will get stuck, is if you have an in depth problem that
required complex troubleshooting, or if you require a part that is
proprietery for their design.

Jerry G.
======

 

[Paul and Paula]

Hi Peter, the SMS kit at the various retailers is all the same kit! I have
noted that Dick Smith is much more expensive than thes others. I have
bought a kit but not assembled it yet. One problem I have is that it is not
so easy to get the phone cable, so Ill have to make my own. Strathfield is
selling suitable clips for $3.95 at present.

Of course, if your pump and sensors are remote from each other it could
become an expensive affair as you may have to buy seperate controllers for
each location. A reliable power supply is also required, and you may want
to measure pump volts as well so you know the pump can start.

Anyhow have fun and let us know how you go.
Regards
Paul

"Peter K" <nospam@nospam.com> wrote in message
news:426c437b@dnews.tpgi.com.au...

I have a small farm that is located in an area with mobile phone coverage.
I
have installed some soil moisture and temperature sensors and have a pump
and watering system. I would like to be able to receive readings from the
sensors as SMS messages and then turn on/off the watering system from my
home about 150 km away, based on my decision about the dryness conditions,
again by sending an SMS. I have seen a few SMS controllers (Jaycar, Dick
Smith etc.) but none seem to do what I want. Any suggestions?

Regards
Peter

 

[Zebra]

Dear All,

The control buttons of the two cassettes had some problems. When you press
play it wil fast forward; press pause it will in record mode ... etc. Any
ideas which part of the deck should I look into?

Thanks in advance.

Tong

 

Funny, I was just there for something they don't have. It happens, and
it was for a Sony so . . . . . . . .

However that is one of the best online sources for datasheets. If they
don't have it good luck. While bdent might have it, it's rare if
datasheet doesn't have it, but it has happened.

Just wait till I scan my old spec manual from 20 years ago ! The
problem is that it is small text and will need to be scanned in about
300 DPI, and there are ALOT of pages.

I'll see if my OCR program can handle it, but most likely it will be
JPGs. Now to find a place to host all that.

Actually for that a P2P network might be best. These are not going to
be small files.

Perhaps I'll scan a page and upload it so you know what I mean, also it
looks like a DOS batch file printed a database, all caps and
dissipation for example might say 170.000 W. On a power transistor do
we need to know the rating to the thousandth of a watt ?

Nonetheless I think it would be a good resource for those fixing old
stuff. One of these days. I do seriously intend to do it when I get the
time.

JURB

 

Try ETMpacific.com.au. They have GPRS/SMS microcontrollers meant for
this sort of control.

They will be more expensive than the SC kit, but you get what you pay
for.
I guess it avoids needing to get a phone as well.

Dale.

Peter K wrote:

I have a small farm that is located in an area with mobile phone
coverage. I
have installed some soil moisture and temperature sensors and have a
pump
and watering system. I would like to be able to receive readings from
the
sensors as SMS messages and then turn on/off the watering system from
my
home about 150 km away, based on my decision about the dryness
conditions,
again by sending an SMS. I have seen a few SMS controllers (Jaycar,
Dick
Smith etc.) but none seem to do what I want. Any suggestions?

Regards
Peter

 

[Unbeliever]

"Daniel" <stoj84@hotmail.com> wrote in message
news:b8wge.103$E7.62@news-server.bigpond.net.au...

Hi all



I have a DC motor from a old RC car and I want to make it into a AC
generator with an output of around 8V or greater.

I have an orange that I want to use as a Ferrari, but have resigned myself
to an intermediate solution: I bought an MX-5. It gets me from point a to
point b with much less effort than the orange.

Cheers,
Alf

 

[Franc Zabkar]

On Wed, 11 May 2005 23:00:23 GMT, "Daniel" <stoj84@hotmail.com> put
finger to keyboard and composed:

I have a DC motor from a old RC car and I want to make it into a AC
generator with an output of around 8V or greater.

DSE have one for $4.

P8951, 920mV @ 31mA to 9.1V @ 220mA, 1000 - 10000 RPM:
http://www.dse.com.au/cgi-bin/dse.storefront/4285bd4b0c1f9aea2740c0a87f9c0752/Product/View/P8951


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.